[Mesa-dev] [Bug 70123] New: Freeze caused by 'winsys/radeon: remove cs_queue_empty' commit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70123

          Priority: medium
            Bug ID: 70123
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: Freeze caused by 'winsys/radeon: remove
                    cs_queue_empty' commit
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jeffblake0 at gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: git
         Component: Other
           Product: Mesa

I was getting the whole wm freeze up immediately after logging into my Openbox
systems and had to switch console to get roll back to a previously working
state. 

There was nothing in any of the system logfiles and disabling things like conky
and compton (the compositor) didn't resolve anything.

I was able to log in via the slim display manager and could see the wallpaper,
but there was no openbox menu (not available via a keyboard shortcut either).
Ctrl-Alt-Bksp put me back to slim, but an attempt at using slim's console login
produced a reponsive but unreadable xterm display (white blocks instead of
text).

Through trial and error I traced a regression caused by the 'winsys/radeon:
remove cs_queue_empty' commit from Sept 22. Doing a git revert -n
0653c66ef40ac553f91b29bbda7f59f7ce6948fa and recompiling fixed the issue for
me.

I'm running debian unstable: 32-bit on a laptop with a Mobility Radeon HD
4530/4570; 64-bit on a desktop with an X850 XT.

I haven't yet had a chance to see if the desktop machine works with the above
solution, but both machines were previously in sync and went wrong with the
same update.

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